The Research And Design Of Key Modules In The Front End Of Wide-band RF Receiver

In recent year,the integration of multiple wireless communication specifications in the same consumer electronics products has become a trend.Receivers capable of supporting various frequency bands have attracted great attention.Therefore,the research of wide-band RF receivers is very important.Low noise amplifier（LNA）and Mixer are the key modules in the front end of wide-band RF receiver.In order to support muti-standard communication systems,it has become an inevitable trend that wide-band low-noise amplifiers and wide-band Mixers replace multiple narrow-band low-noise amplifiers and narrow-band Mixers integrated in order to realize a wide-band system.And in order to maintain the battery powered life of the portable equipment,low power consumption and low supply voltage are also key research directions.In this paper,the basic structure of the RF receiver was introduced.Then the main performance parameters and wide-band design structures of the low-noise amplifier and Mixer were introduced.Based on these theoretical foundations,the designs in this paper adopted UMC 180nm process.The design,simulation,layout design,post-simulation and process corner simulation were in the Cadence Virtuoso IC615.In order to meet the requirements of multiple standards,low power consumption,and low power supply voltage,this paper designed a 0.4～2.5 GHz low noise amplifier and a 0.4～3.4 GHz down-conversion mixer:（1）0.4～2.5 GHz low noise amplifier,the circuit was based on negative feedback technique,using inductive peaking technique and a two-stage amplifying structure to further optimize the bandwidth and gain.It used current reuse technique for low-power design and improved the bias mode of the current reuse technique,so that the circuit can work under 1 V power supply voltage.And the circuit used current mirror technology instead of tail current technology to design the bias circuit,which made the circuit easier to adjust,and improved the noise and gain of the circuit.The simulation results show that the LNA works under a power supply voltage of 1 V,at 0.4～2.5 GHz,the noise figure of the circuit is less than 2.48 d B,the gain is higher than 15 d B,S₁₁is less than-15 d B,the power consumption is 5 m W,and the input third-order intercept point（IIP3）is-8.95 d Bm.（2）0.4～3.4 GHz down-conversion mixer,the circuit is based on the source-driven mixer structure which evolved from the traditional Gilbert mixer.It is more suitable for low voltage design.In order to obtain sufficient gain,current reuse technique is used.This technique consumes lower power consumption while obtaining the same gain.In addition,in order to improve linearity,the circuit adds derivative superposition technology that does not consume excessive power consumption and current injection technology that does not consume additional power consumption.The simulation results show that the mixer also works under 1 V power supply voltage,when the RF input is 0.4～3.4 GHz,and the intermediate frequency output is 10 MHz.The circuit adopts two gain modes.The higher gain is 7.5 d B.The noise figure is 14 d B and the IIP3 is-2.8 d Bm.The power consumption is 4.3 m W.The lower gain is 3.2 d B.The noise figure is 16 d B.The IIP3 is 4.1 d Bm,and the power consumption is 2.95 mW.